I agree with cowboy. Here's what my 30 years deer hunting experience tells me. Fresh human urine, like the kind falling to the ground from the human will scare the hell out of deer if they are downwind and in the vicinity. I've witnessed this more than once. However, human urine on the ground after a certain period of time does not scare deer, in fact it seems to attract the bucks and make them go into the scrape mode. I don't know if it takes a few hours or a few days to lose whatever it is to scare the deer but I know it does.